DISCLAIMER: I DO NOT OWN KHR.
Summary: Verde has created a pill that allow him and the rest of the arcobaleno (except Yuni and Lal of course) to grow to their original age and size. What everyone didn't know is that the pill has a terrible side effect (on Tsuna's sanity).
Surprisingly, Fon was the first arcobaleno that succumbed into the side effect of the pill.
Tsuna should have noticed something was wrong when Fon, who was now in his 10 years old body, didn't have his usual serene smile on his face when he greeted him.
"What's wrong, Fon-san?" Tsuna asked.
"I'm craving for mapo-tofu."
"Well, I'll ask the chef to prepare it for you for lunch then."
"But, I still can't eat those without tearing up in my current age. It's still too spicy for me to handle. But, I want to eat it now." Fon frowned.
"Then, I'll ask the chef to make it milder."
-Lunch time-
"So, Fon-san, how was it?"
"….."
"Fon-san?"
Fon's eyes turned watery. And the fork that he was holding engulfed in storm flames in the next second. So was the whole dining table.
"Whoa, cool down, kid." Yamamoto immediately doused rain flame over to calm him down.
Fon blinked and his face turned red from embarrassment. He immediately left to calm himself down.
Tsuna stared at the remains of the table. "I'm really glad that Verde invented that reality illusion gloves."
(Because it is better to use table made from illusion than buying a new one if it is going to get destroyed again)
If Tsuna's mind wasn't too preoccupied with his first boss meeting that he was going to have next week, he would have realised that Fon's trigger has already been activated.
Tsuna's return from his two days' meeting trip was greeted by the destruction of his mansion's east wing and specifically, his office where all his paperworks and homeworks are in there.
If it weren't for Gokudera and Yamamoto who immediately tackled him down, he would have gotten blast off by a huge wave of storm and cloud flames since he was too stunned to move.
In hindsight, Tsuna would have let himself got blasted off and ended up in hospital if he knew what's going to happen within the next few days….or weeks.
"Wao, there's two Hibari?" Yamamoto was the first one to stand up and ask cheerfully.
"You baseball-idiot! That's teenage Fon!" Gokudera said as he helped Tsuna to stand up. He then turned towards Fuuta who was running towards them. "What happened?"
"Hibari-san got mad because Fon-san was disturbing his sleep by nagging at him about mapo tofu non-stop. And Fon-san got mad because Hibari-san ignored him. And both of them ended up fighting." Fuuta said between his gasps for air.
Tsuna remained awfully silent as Yamamoto tried to shout out to the fighting duo to stop.
"Juudaime, should I call Bucking Horse to rein in Hibari?"
"Dino-san huh?" Tsuna suddenly brightened up and smiled. "Ne, Hayato, Dino-nii always claims to be my big brother right? And brothers always share moment of joys right?"
"Yes? Hmm… Juudaime?"
"It's all good then." Tsuna then took out his phone and phoned someone.
"Mukuro, would you come meet me now? I have a favour to ask you~~"
Mukuro materialised himself within seconds. He took a look at the fighting duo before eying the smiling Decimo. "What is it, Tsunayoshi?"
"I allow you to play with Fon and Kyoya if you bring the two of them to visit Dino now."
"Why would I do that if I can play with them right now?" Mukuro asked with a hint of amusement in his voice.
"Well, I'll also allow you to possess my body for one day if you make sure the two of them accompany Dino until Fon is back to normal."
And that's how Dino got to enjoy stormy cloudy weather with a tinge of mist in his mansion for one whole week.
A/n: Just to clarify, the triggers and the side effects and the duration of it for each arcobaleno are different. You are actually welcomed to guess or even suggest the triggers or the side effects in the review because I'm free to take up requests for now. ^_^